`file` command mime types are inconsistent on RHEL6 with RHEL5.

Issue

• Why does the mime types inconsistent on Red Hat Enterprise Linux 6 with Red Hat Enterprise Linux 5?
• When run with the --mime option, the file command returns a generic result for ISO9660 files that is inconsistent with the version delivered with RHEL5.x.
• On RHEL5.x, file-4.17 (expected result):

$ file --brief --mime rhel-workstation-6.4-x86_64-dvd.iso
application/x-iso9660

• On RHEL6.4, file-5.04 (generic result):

$ file --brief --mime rhel-workstation-6.4-x86_64-dvd.iso
application/octet-stream; charset=binary

• While technically correct, the significant magic for ISO9660 (string CD001 at offset 32769) has been missed.
• Note that when run without the --mime option, the newer version of file returns a result consistent with RHEL5:

$ file --brief rhel-workstation-6.4-x86_64-dvd.iso
ISO 9660 CD-ROM filesystem data 'RHEL_6.4 x86_64 Disc 1         ' (bootable)